Strontium oxide

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Strontium oxide[1]
__ Sr2+     __ O2-
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CAS number 1314-11-0 YesY
PubChem 73975
EC number 215-219-9
Jmol-3D images Image 1
Molecular formula SrO
Molar mass 103.619 g/mol
Appearance colorless cubic crystals
Density 4.70 g/cm3
Melting point 2,531 °C (4,588 °F; 2,804 K)
Boiling point 3,200 °C (5,790 °F; 3,470 K) (decomposes)
Solubility in water reacts, forms Sr(OH)2
Solubility miscible with potassium hydroxide
slightly soluble in alcohol
insoluble in acetone and ether
Refractive index (nD) 1.810 [2]
Crystal structure Halite (cubic), cF8
Space group Fm3m, No. 225
Octahedral (Sr2+); octahedral (O2–)
heat capacity
44.3 J·mol−1·K−1
Std molar
57.2 J·mol−1·K−1
Std enthalpy of
-592.0 kJ·mol−1
EU Index Not listed
Flash point Non-flammable
Related compounds
Other anions Strontium sulfide
Other cations Beryllium oxide
Magnesium oxide
Calcium oxide
Barium oxide
Related compounds Strontium hydroxide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Strontium oxide or strontia, SrO, is formed when strontium reacts with oxygen. Burning strontium in air results in a mixture of strontium oxide and strontium nitride. It also forms from the decomposition of strontium carbonate SrCO3. It is a strongly basic oxide.


About 8% by weight of television picture tube glass is strontium oxide, which has been the major use of strontium since 1970.[3] Color televisions and other devices containing color cathode ray tubes sold in the United States are required by law to use strontium in the faceplate to block X-ray emission (these X-ray emitting TV's are no longer in production). Lead oxide can be used in the neck and funnel, but causes discoloration when used in the faceplate.[4]


Elemental strontium is formed when strontium oxide is heated with aluminium in a vacuum.[1]


  1. ^ a b Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, FL: CRC Press. pp. 4–87. ISBN 0-8493-0594-2. 
  2. ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
  3. ^ Ober, Joyce A.; Polyak, Désirée E. "Mineral Yearbook 2007:Strontium". United States Geological Survey. Retrieved 2009-09-14. 
  4. ^ Méar, F; Yot, P; Cambon, M; Ribes, M (2006). "The characterization of waste cathode-ray tube glass.". Waste management 26 (12): 1468–76. doi:10.1016/j.wasman.2005.11.017. ISSN 0956-053X. PMID 16427267. 

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